Moon Anh

2 năm trước

1 gia đình sử dụng 1 bếp điện có ghi 220V-800w được sử dụng với hiệu điện thế 220V để đun 2 lít nước ở nhiệt độ ban đầu là 20°C thì mất thời gian là 20 phút hỏi trong 30 ngày phải trả bao nhiêu tiền điện cho việc đun nước Biết 1kwh là 1500đ giải theo cách lớp 9 giúp mình với ạ

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Dương Yến

2 năm trước

Đáp án:

T=12000 đồng

Giải thích các bước giải:

Điện năng tiêu thụ :

$A = P.t = 800.\frac{1}{3}{.10^{ - 3}}.30 = 8KWh$

Tiền phải trả:

T=8.1500=12000 đồng

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Choose the best answer.
We should decorate our living room with _ orange banner. We also need ____ ribbons, balloons, party hats and costume.

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I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.